<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>test</title>
</head>
<body>
    <h1>test</h1>
    <form action = "#" method = "post">  <!--测试使用-->
        <input type="text" name="username" placeholder="请输入用户名"/><br>
        <input type="password" name="password"  placeholder="请输入密码"/><br>
        <input type="submit"  value="登录">
    </form>
</body>
</html>